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Radeon HD 4870 X2 vs Radeon RX 480

Intro

The Radeon HD 4870 X2 has a GPU core clock speed of 750 MHz, and the 1024 MB of GDDR5 RAM runs at 900 MHz through a 256-bit bus. It also is comprised of 800(160x5) Stream Processors, 40 Texture Address Units, and 16 ROPs.

Compare that to the Radeon RX 480, which comes with clock speeds of 1120 MHz on the GPU, and 2000 MHz on the 8192 MB of GDDR5 memory. It features 2304 SPUs as well as 144 Texture Address Units and 32 Rasterization Operator Units.

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon RX 480 150 Watts
Radeon HD 4870 X2 350 Watts
Difference: 200 Watts (133%)

Memory Bandwidth

In theory, the Radeon RX 480 will be 14% quicker than the Radeon HD 4870 X2 overall, because of its higher bandwidth. (explain)

Radeon RX 480 262144 MB/sec
Radeon HD 4870 X2 230400 MB/sec
Difference: 31744 (14%)

Texel Rate

The Radeon RX 480 is a lot (about 169%) more effective at anisotropic filtering than the Radeon HD 4870 X2. (explain)

Radeon RX 480 161280 Mtexels/sec
Radeon HD 4870 X2 60000 Mtexels/sec
Difference: 101280 (169%)

Pixel Rate

If using high levels of AA is important to you, then the Radeon RX 480 is superior to the Radeon HD 4870 X2, by a large margin. (explain)

Radeon RX 480 35840 Mpixels/sec
Radeon HD 4870 X2 24000 Mpixels/sec
Difference: 11840 (49%)

Please note that the above 'benchmarks' are all just theoretical - the results were calculated based on the card's specifications, and real-world performance may (and probably will) vary at least a bit.

One or more cards in this comparison are multi-core. This means that their bandwidth, texel and pixel rates are theoretically doubled - this does not mean the card will actually perform twice as fast, but only that it should in theory be able to. Actual game benchmarks will give a more accurate idea of what it's capable of.

Price Comparison

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Radeon HD 4870 X2

Amazon.com

Check prices at:

Radeon RX 480

Amazon.com

Check prices at:

Please note that the price comparisons are based on search keywords - sometimes it might show cards with very similar names that are not exactly the same as the one chosen in the comparison. We do try to filter out the wrong results as best we can, though.

Specifications

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Model Radeon HD 4870 X2 Radeon RX 480
Manufacturer AMD AMD
Year Aug 12, 2008 June 2016
Code Name R700 Polaris 10
Memory 1024 MB (x2) 8192 MB
Core Speed 750 MHz (x2) 1120 MHz
Memory Speed 3600 MHz (x2) 8000 MHz
Power (Max TDP) 350 watts 150 watts
Bandwidth 230400 MB/sec 262144 MB/sec
Texel Rate 60000 Mtexels/sec 161280 Mtexels/sec
Pixel Rate 24000 Mpixels/sec 35840 Mpixels/sec
Unified Shaders 800(160x5) (x2) 2304
Texture Mapping Units 40 (x2) 144
Render Output Units 16 (x2) 32
Bus Type GDDR5 GDDR5
Bus Width 256-bit (x2) 256-bit
Fab Process 55 nm 14 nm
Transistors 956 million 5700 million
Bus PCIe 2.0 x16 (PCIe bridge) PCIe 3.0 x16
DirectX Version DirectX 10.1 DirectX 12.0
OpenGL Version OpenGL 3.0 OpenGL 4.5

Memory Bandwidth: Memory bandwidth is the maximum amount of information (counted in megabytes per second) that can be transferred past the external memory interface in a second. It's worked out by multiplying the bus width by its memory clock speed. If the card has DDR RAM, it should be multiplied by 2 once again. If it uses DDR5, multiply by 4 instead. The better the bandwidth is, the faster the card will be in general. It especially helps with anti-aliasing, HDR and higher screen resolutions.

Texel Rate: Texel rate is the maximum amount of texture map elements (texels) that can be applied in one second. This is worked out by multiplying the total texture units of the card by the core clock speed of the chip. The better this number, the better the card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied in a second.

Pixel Rate: Pixel rate is the maximum number of pixels the video card can possibly record to its local memory per second - measured in millions of pixels per second. The number is worked out by multiplying the number of ROPs by the the card's clock speed. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel output rate also depends on quite a few other factors, most notably the memory bandwidth - the lower the memory bandwidth is, the lower the ability to get to the max fill rate.

Display Prices

Hide Prices

Radeon HD 4870 X2

Amazon.com

Check prices at:

Radeon RX 480

Amazon.com

Check prices at:

Please note that the price comparisons are based on search keywords - sometimes it might show cards with very similar names that are not exactly the same as the one chosen in the comparison. We do try to filter out the wrong results as best we can, though.

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